This issue is discussed extensively in “the art of Unix programming” if we want to play the authority and experience game.

> multithreaded CPU-intensive code would be a nice, obvious solution to a problem

Processes are well supported in python. But if you’re maxing your CPU core with the right algorithm then python was probably the wrong tool.

> my experience has been that these are very real.

When you’re used to working one way it may seem impossible to frame the problem differently. Just to remind you this is a NEW feature in python. JavaScript, perl, and bash, also do not support multi threading for similar reasons.

One school of design says if you can think of a use case, add that feature. Another tries to maintain invariants of a system.